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</pre></div><pre class="rust"><code><span class="kw">use </span>std::fmt;
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<span class="kw">use </span>once_cell::sync::Lazy;
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<span class="kw">use </span>regex::Regex;
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<span class="kw">use </span>serde::de;
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<span class="kw">use crate</span>::{AsResult, Error, Parse};
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<span class="doccomment">/// A timeout duration in milliseconds or seconds.
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</span><span class="attr">#[derive(Debug, Clone, PartialEq, Eq, Hash)]
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</span><span class="kw">pub enum </span>Timeout {
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<span class="doccomment">/// The default timeout. Depends on context.
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</span>Default,
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<span class="doccomment">/// Timeout in milliseconds.
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</span>Milliseconds(usize),
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<span class="doccomment">/// Timeout in seconds.
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</span>Seconds(usize),
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}
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<span class="kw">impl </span>Parse <span class="kw">for </span>Timeout {
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<span class="kw">fn </span>parse(string: <span class="kw-2">&</span>str) -> AsResult<<span class="self">Self</span>> {
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<span class="kw">pub static </span>FMT: Lazy<Regex> = Lazy::new(|| {
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Regex::new(<span class="string">r"^\d+ (milliseconds|seconds)$"</span>).expect(<span class="string">"Failed to compile regex: FMT"</span>)
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});
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<span class="kw">pub static </span>DIGITS: Lazy<Regex> =
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Lazy::new(|| Regex::new(<span class="string">r"^\d+"</span>).expect(<span class="string">"Failed to compile regex: DIGITS"</span>));
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<span class="kw">pub static </span>UNIT: Lazy<Regex> = Lazy::new(|| {
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Regex::new(<span class="string">r"(milliseconds|seconds)$"</span>).expect(<span class="string">"Failed to compile regex: UNIT"</span>)
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});
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<span class="macro">macro_rules! </span>invalid_value {
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(<span class="macro-nonterminal">$got</span>:expr) => {
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<span class="prelude-val">Err</span>(<span class="macro">InvalidValue! </span>{
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expected: <span class="string">"a string of the format \"N seconds\" or \"N milliseconds\" where N is an integer > 0"</span>,
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got: <span class="macro-nonterminal">$got</span>,
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})
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}
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}
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<span class="kw">match </span>string {
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<span class="string">"default" </span>=> <span class="prelude-val">Ok</span>(Timeout::Default),
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string <span class="kw">if </span>!FMT.is_match(string) => <span class="macro">invalid_value!</span>(string),
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string => <span class="kw">match </span>(DIGITS.find(string), UNIT.find(string)) {
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(<span class="prelude-val">None</span>, <span class="kw">_</span>) | (<span class="kw">_</span>, <span class="prelude-val">None</span>) => <span class="macro">invalid_value!</span>(string),
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(<span class="prelude-val">Some</span>(digits), <span class="prelude-val">Some</span>(unit)) => {
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<span class="kw">let </span>digits = <span class="kw-2">&</span>string[digits.range()];
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<span class="kw">let </span>unit = <span class="kw-2">&</span>string[unit.range()];
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<span class="kw">match </span>(digits.parse(), unit) {
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(<span class="prelude-val">Ok</span>(n), <span class="string">"milliseconds"</span>) => <span class="prelude-val">Ok</span>(Timeout::Milliseconds(n)),
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(<span class="prelude-val">Ok</span>(n), <span class="string">"seconds"</span>) => <span class="prelude-val">Ok</span>(Timeout::Seconds(n)),
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<span class="kw">_ </span>=> <span class="macro">invalid_value!</span>(string),
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}
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}
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},
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}
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}
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}
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<span class="kw">impl</span><<span class="lifetime">'de</span>> de::Deserialize<<span class="lifetime">'de</span>> <span class="kw">for </span>Timeout {
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<span class="kw">fn </span>deserialize<D>(deserializer: D) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, D::Error>
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<span class="kw">where
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</span>D: de::Deserializer<<span class="lifetime">'de</span>>,
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{
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<span class="kw">struct </span>TimeoutVisitor;
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<span class="kw">impl</span><<span class="lifetime">'de</span>> de::Visitor<<span class="lifetime">'de</span>> <span class="kw">for </span>TimeoutVisitor {
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<span class="kw">type </span>Value = Timeout;
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<span class="kw">fn </span>expecting(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter<<span class="lifetime">'_</span>>) -> fmt::Result {
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<span class="kw">let </span>msg = <span class="string">"Either \"default\", \"disabled\", \"os\", or a string of the format \"N seconds\" where N is an integer > 0"</span>;
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f.write_str(msg)
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}
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<span class="kw">fn </span>visit_str<E>(<span class="self">self</span>, value: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>::Value, E>
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<span class="kw">where
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</span>E: de::Error,
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{
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<span class="kw">match </span>Timeout::parse(value) {
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<span class="prelude-val">Ok</span>(num_workers) => <span class="prelude-val">Ok</span>(num_workers),
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<span class="prelude-val">Err</span>(Error::InvalidValue { expected, got, .. }) => <span class="prelude-val">Err</span>(
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de::Error::invalid_value(de::Unexpected::Str(<span class="kw-2">&</span>got), <span class="kw-2">&</span>expected),
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),
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<span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="macro">unreachable!</span>(),
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}
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}
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}
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deserializer.deserialize_string(TimeoutVisitor)
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}
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}
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</code></pre></div></section></main></body></html> |